[1] Brigham & Womens Hosp, Channing Div Network Med, 75 Francis St, Boston, MA 02115 USA
[2] Univ Alabama Birmingham, Dept Radiol, Birmingham, AL USA
[3] Brigham & Womens Hosp, Div Pulm & Crit Care Med, 75 Francis St, Boston, MA 02115 USA
[4] Univ Calif San Diego, Dept Radiol, San Diego, CA 92103 USA
[5] Brigham & Womens Hosp, Dept Radiol, 75 Francis St, Boston, MA 02115 USA
[6] Mayo Clin, Dept Radiol, Jacksonville, FL 32224 USA
[7] Boston Univ, Sch Med, Dept Med, Boston, MA 02118 USA
[8] Brigham & Womens Hosp, Div Sleep & Circadian Disorders Med, 75 Francis St, Boston, MA 02115 USA